from the GNU version of the Collaborative International Dictionary of English

adj. Deserving of; -- in a good or bad sense, but chiefly in a good sense.

adj. Having possessions equal to; having wealth or estate to the value of.

n. That quality of a thing which renders it valuable or useful; sum of valuable qualities which render anything useful and sought; value; hence, often, value as expressed in a standard, as money; equivalent in exchange; price.

intransitive v. To be; to become; to betide; -- now used only in the phrases, woe worth the day, woe worth the man, etc., in which the verb is in the imperative, and the nouns day, man, etc., are in the dative. Woe be to the day, woe be to the man, etc., are equivalent phrases.

from The Century Dictionary and Cyclopedia

To be or become.

To happen; betide: now used only in the archaic imprecative phrases woe worth the day, the man, etc., in which worth is equivalent to be to, and the noun is in the dative.

Worthy; honorable; esteemed; estimable.

Having worth, esteem, or value in a given degree; representing a relative or comparative worth (of): used generally with a noun of measurement dependent directly upon it without a preposition.

Specifically

Having a specified value in money or exchange; representing under fair conditions a price or cost (of); equivalent in value to: expressing either actual market value, or value obtainable under favorable or just conditions.

Possessed of; having estate to the value of; possessing: as, a man worth five millions.

Having a specified moral value or importance; estimable or esteemed in a given way; reaching a certain grade of excellence.

Entitled to, by reason of excellence, importance, etc.; meriting; deserving: having the same construction as in sense 2: as, the castle is worth defending; the matter is not worth notice.

n. Value, especially as expressed in terms of some standard of equivalency or exchange: as, what is his house worth? the worth of a commodity is usually the price it will bring in market, but price is not always worth.

n. French couturier (born in England) regarded as the founder of Parisian haute couture; noted for introducing the bustle (1825-1895)

n. the quality that renders something desirable or valuable or useful

n. an indefinite quantity of something having a specified value

adj. having a specified value

adj. worthy of being treated in a particular way

Etymologies

Middle English, from Old English weorth; see wer-2 in Indo-European roots.

Middle English worthen, from Old English weorthan; see wer-2 in Indo-European roots.

(American Heritage® Dictionary of the English Language, Fourth Edition)

From worth or wurth, from Old English weorþ, from Proto-Germanic *werþaz (“towards, opposite”) (the noun developing from the adjective). Cognate with German wert/Wert, Dutch waard ("adjective"), Swedish värd. (Wiktionary)

From Old English weorþan, from Proto-Germanic *werþanan, from Proto-Indo-European *wert-. Cognate with Dutch worden, German werden, Old Norse verða (Norwegian verta, Swedish varda), Latin vertere. (Wiktionary)

Examples

The first  to his boss, Fred Fielding, on Feb. 3, 1984  denounced the notion of equal pay for comparable worth, saying It is difficult to exaggerate the perniciousness of the comparable worth theory.

Annita, in the old ragged dresses in which they were found; and if he paints their little dimpled shoulders and cunning little legs and feet half as pretty as they really are, I know you will say with me, that the "Little Emigrants" are worth looking at, and _worth loving_.

Give him history books where every hero he is supposed to model himself after, every president who led his country, every philosopher who ever uttered a word worth remembering, every inventor who pushed back the night for the human race was black.

Another term worth throwing out there is "PAN," or Personal Area Network, which is used for technology like Bluetooth and refers to the peripherals (mice, speakers, keyboards, etc.) you've networked together.

Heading a preposed adjunct, it needs to be predicated of the subject of the following clause:* Worth a million bucks, the good times were set to roll.(cf. With a million bucks in our pocket, the good times were set to roll. - Prepositions can do this, adjectives can't.)

It can't be fronted (pied-piped) along with a relative pronoun:This was less than the amount which she thought the land was worth.* This was less than the amount worth which she thought the land was.